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Kubanek, Alexander

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Kubanek

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Alexander

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Kubanek, Alexander
Author's Publications: search.filters.isAuthorOfPublication.c2894ab9-b041-48b6-8fbf-154feb58f46c

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Now showing 1 - 4 of 4
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    Integrated Diamond Networks for Quantum Nanophotonics
    (American Chemical Society (ACS), 2012) Hausmann, Birgit Judith Maria; Shields, Brendan John; Quan, Qimin; Maletinsky, Patrick; McCutcheon, Murray; Choy, Jennifer Tze-Heng; Babinec, Tom M.; Kubanek, Alexander; Yacoby, Amir; Lukin, Mikhail; Loncar, Marko
    We demonstrate an integrated nanophotonic network in diamond, consisting of a ring resonator coupled to an optical waveguide with grating in- and outcouplers. Using a nitrogen-vacancy color center embedded inside the ring resonator as a source of photons, single photon generation and routing at room temperature is observed. Furthermore, we observe a large overall photon extraction efficiency (10%) and high quality factors of ring resonators (3200 for waveguide-coupled system and 12 600 for a bare ring).
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    Quantum Interference of Single Photons from Remote Nitrogen-Vacancy Centers in Diamond
    (American Physical Society (APS), 2012) Sipahigil, Alp; Goldman, Michael Lurie; Togan, E; Chu, Yiwen; Markham, M.; Twitchen, D. J.; Zibrov, Alexander; Kubanek, Alexander; Lukin, Mikhail
    We demonstrate quantum interference between indistinguishable photons emitted by two nitrogen-vacancy (NV) centers in distinct diamond samples separated by two meters. Macroscopic solid immersion lenses are used to enhance photon collection efficiency. Quantum interference is verified by measuring a value of the second-order cross-correlation function g(2)(0)=0.35±0.04<0.5. In addition, optical transition frequencies of two separated NV centers are tuned into resonance with each other by applying external electric fields. Extension of the present approach to generate entanglement of remote solid-state qubits is discussed.
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    Phonon-Induced Population Dynamics and Intersystem Crossing in Nitrogen-Vacancy Centers
    (American Physical Society (APS), 2015) Goldman, Michael Lurie; Sipahigil, Alp; Doherty, M. W.; Yao, Norman; Bennett, Steven; Markham, M.; Twitchen, D. J.; Manson, N. B.; Kubanek, Alexander; Lukin, Mikhail
    We report direct measurement of population dynamics in the excited state manifold of a nitrogen-vacancy (NV) center in diamond. We quantify the phonon-induced mixing rate and demonstrate that it can be completely suppressed at low temperatures. Further, we measure the intersystem crossing (ISC) rate for different excited states and develop a theoretical model that unifies the phonon-induced mixing and ISC mechanisms. We find that our model is in excellent agreement with experiment and that it can be used to predict unknown elements of the NV center’s electronic structure. We discuss the model’s implications for enhancing the NV center’s performance as a room-temperature sensor.
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    State-selective intersystem crossing in nitrogen-vacancy centers
    (American Physical Society (APS), 2015) Goldman, Michael Lurie; Doherty, M. W.; Sipahigil, Alp; Yao, Norman; Bennett, Steven; Manson, N. B.; Kubanek, Alexander; Lukin, Mikhail
    The intersystem crossing (ISC) is an important process in many solid-state atomlike impurities. For example, it allows the electronic spin state of the nitrogen-vacancy (NV) center in diamond to be initialized and read out using optical fields at ambient temperatures. This capability has enabled a wide array of applications in metrology and quantum information science. Here, we develop a microscopic model of the state-selective ISC from the optical excited state manifold of the NV center. By correlating the electron-phonon interactions that mediate the ISC with those that induce population dynamics within the NV center's excited state manifold and those that produce the phonon sidebands of its optical transitions, we quantitatively demonstrate that our model is consistent with recent ISC measurements. Furthermore, our model constrains the unknown energy spacings between the center's spin-singlet and spin-triplet levels. Finally, we discuss prospects to engineer the ISC in order to improve the spin initialization and readout fidelities of NV centers.